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Cometic StreetPro top-end gasket kit for Pontiac 455 Big Block V8 (4.200" bore) includes an MLS .051" cylinder head gasket and the seals needed for a rebuild. StreetPro kits prioritize quality materials—MLS, AFM, aramid fiber and ArmorClad—and use embossed outer layers to improve sealing across varied surfaces. The kits are aimed at budget-minded street builders who want complete top-end coverage.
Cometic Pontiac 455 Big Block V8 .051in MLS Street Pro Cylinder Head Gasket 4200in Bore
